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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Activity Under Stock Option Plan | The following table is a summary of the activity under both the BancFirst ISOP and the BancFirst Directors’ Stock Option Plan:
|  |  |  |  |  |  |  |  |  | Wgtd. Avg. |  |  |  |
|  |  |  |  |  | Wgtd. Avg. |  |  | Remaining |  | Aggregate |
|  |  |  |  |  | Exercise |  |  | Contractual |  | Intrinsic |
|  | Options |  |  | Price |  |  | Term |  | Value |
|  | (Dollars in thousands, except option data) |
Year Ended December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 1,018,149 |  |  | $ | 40.69 |  |  |  |  |  |  |
Options granted |  |  | 30,000 |  |  |  | 58.08 |  |  |  |  |  |  |
Options exercised |  |  | (310,699 | ) |  |  | 31.28 |  |  |  |  |  |  |
Options canceled, forfeited, or expired |  |  | (30,000 | ) |  |  | 55.88 |  |  |  |  |  |  |
Outstanding at December 31, 2016 |  |  | 707,450 |  |  |  | 44.92 |  |  | 9.59Yrs |  | $ | 34,049 |
Exercisable at December 31, 2016 |  |  | 325,200 |  |  |  | 37.19 |  |  | 6.78Yrs |  | $ | 18,167 |
Year Ended December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2014 |  |  | 1,029,657 |  |  | $ | 36.55 |  |  |  |  |  |  |
Options granted |  |  | 133,000 |  |  |  | 59.37 |  |  |  |  |  |  |
Options exercised |  |  | (120,758 | ) |  |  | 26.60 |  |  |  |  |  |  |
Options canceled, forfeited, or expired |  |  | (23,750 | ) |  |  | 37.16 |  |  |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 1,018,149 |  |  |  | 40.69 |  |  | 8.84Yrs |  | $ | 18,251 |
Exercisable at December 31, 2015 |  |  | 499,599 |  |  |  | 32.98 |  |  | 5.53Yrs |  | $ | 12,812 |
Options Granted and Options Exercised Under Stock Option Plan | The following table has additional information regarding options granted and options exercised under both the BancFirst ISOP and the BancFirst Directors’ Stock Option Plan:
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | (Dollars in thousands, except per share data) |
Weighted average grant-date fair value per share of options granted |  | $ | 11.92 |  |  | $ | 11.72 |  |  | $ | 12.27 |
Total intrinsic value of options exercised |  |  | 12,230 |  |  |  | 4,376 |  |  |  | 5,597 |
Cash received from options exercised |  |  | 9,720 |  |  |  | 3,212 |  |  |  | 4,870 |
Tax benefit realized from options exercised |  |  | 4,731 |  |  |  | 1,693 |  |  |  | 2,165 |
Stock-based Employee Compensation Expense | The following table is a summary of the Company’s recorded stock-based compensation expense:
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | (Dollars in thousands) |
Stock-based compensation expense |  | $ | 1,636 |  |  | $ | 1,717 |  |  | $ | 1,676 |
Tax benefit |  |  | 633 |  |  |  | 664 |  |  |  | 648 |
Stock-based compensation expense, net of tax |  | $ | 1,003 |  |  | $ | 1,053 |  |  | $ | 1,028 |
Unearned Stock-based Compensation Expense | The Company will continue to amortize the unearned stock-based compensation expense over the remaining vesting period of approximately seven years. The following table shows the unearned stock-based compensation expense:
|  | December 31, 2016 |
|  | (Dollars in thousands) |
Unearned stock-based compensation expense |  | $ | 2,770 |
Assumptions Used for Computing Stock-Based Compensation Expense | The following table shows the assumptions used for computing stock-based compensation expense under the fair value method:
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Risk-free interest rate |  | 1.46 to 2.02% |  |  | 1.83 to 2.26% |  |  | 2.10 to 2.54% |
Dividend yield |  |  | 2.00 | % |  |  | 2.00 | % |  |  | 2.00 | %
Stock price volatility |  | 20.41 to 21.78% |  |  | 18.23 to 21.08% |  |  | 18.03 to 18.98% |
Expected term |  | 10 Yrs |  |  | 10 Yrs |  |  | 10 Yrs |
Summary of Accumulated Stock Units | A summary of the accumulated stock units is as follows:
|  | December 31, |
|  | 2016 |  |  | 2015 |
Accumulated stock units |  |  | 70,022 |  |  |  | 66,376 |
Average price |  | $ | 41.74 |  |  | $ | 39.64 |

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